Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 49, NWS Austin/San Antonio, TX

April 9, 2020Blanco County, Hays County, Travis County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 9, 2020, 2:48 PM CDT for Blanco County, Hays County, Travis County, Texas. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 9, 2020, 2:48 PM CDT (19:48 UTC)
Expired: Apr 9, 2020, 3:30 PM CDT
In force: 42 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Blanco County, TX, Hays County, TX, Travis County, TX

The radar

The Austin/San Antonio radar (KEWX), 46 km from the middle of the area, began a volume at 19:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 2:47 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 7.8 hours before the alert went out and 266 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2030 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1296 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

235 
WUUS54 KEWX 091948
SVREWX
TXC031-209-453-092030-
/O.NEW.KEWX.SV.W.0049.200409T1948Z-200409T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
248 PM CDT Thu Apr 9 2020

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northwestern Hays County in south central Texas...
  West central Travis County in south central Texas...
  Southeastern Blanco County in south central Texas...

* Until 330 PM CDT.

* At 248 PM CDT, a severe thunderstorm was located near Twin Sisters,
  or near Blanco, moving northeast at 20 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Dripping Springs, Blanco, Bear Creek, Twin Sisters, Henly, Payton,
  Driftwood and Mount Gainor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail, damaging winds, and continuous cloud to ground lightning
are occurring with this storm. Move indoors immediately. Lightning is
one of nature's leading killers. Remember, if you can hear thunder,
you are close enough to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3014 9790 3001 9826 3004 9830 2997 9837
      2996 9841 3007 9847 3037 9812
TIME...MOT...LOC 1948Z 243DEG 19KT 3004 9837 

HAIL...1.00IN
WIND...<50MPH
 
$$

1 follow-up statement

093 
WWUS54 KEWX 092018
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
318 PM CDT Thu Apr 9 2020

TXC031-453-092027-
/O.CAN.KEWX.SV.W.0049.000000T0000Z-200409T2030Z/
Travis TX-Blanco TX-
318 PM CDT Thu Apr 9 2020

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL TRAVIS AND
SOUTHEASTERN BLANCO COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened, 
moved out of the warned area. Therefore, the warning has been 
cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Texas.

LAT...LON 3014 9791 3001 9826 3002 9827 3029 9809
TIME...MOT...LOC 2017Z 259DEG 17KT 3006 9815 

$$

TXC209-092030-
/O.CON.KEWX.SV.W.0049.000000T0000Z-200409T2030Z/
Hays TX-
318 PM CDT Thu Apr 9 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR NORTHWESTERN HAYS COUNTY...

At 317 PM CDT, a severe thunderstorm was located near Woodcreek, or
near Wimberley, moving east at 20 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Dripping Springs, Driftwood and Mount Gainor. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3014 9791 3001 9826 3002 9827 3029 9809
TIME...MOT...LOC 2017Z 259DEG 17KT 3006 9815 

HAIL...1.00IN
WIND...<50MPH
 
$$

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 12:30 PM CDT	Special Weather Statement	EWX	Gillespie, Kerr	60 min
Apr 9, 1:18 PM CDT	Special Weather Statement	EWX	Burnet, Llano	57 min
Apr 9, 2:11 PM CDT	Special Weather Statement	EWX	Burnet	64 min
Apr 9, 2:23 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Travis, Williamson	52 min
Apr 9, 2:30 PM CDT	Special Weather Statement	EWX	Kendall	45 min
Apr 9, 2:54 PM CDT	Severe Thunderstorm Warning	EWX	Williamson	36 min
Apr 9, 2:59 PM CDT	Special Weather Statement	EWX	Williamson	61 min
Apr 9, 3:23 PM CDT	Special Weather Statement	EWX	Dimmit	52 min
Apr 9, 3:28 PM CDT	Severe Thunderstorm Warning	EWX	Bastrop, Lee, Williamson	62 min
Apr 9, 3:30 PM CDT	Special Weather Statement	EWX	Hays	45 min
Apr 9, 3:48 PM CDT	Severe Thunderstorm Warning	EWX	Hays	27 min
Apr 9, 4:11 PM CDT	Special Weather Statement	EWX	Dimmit	49 min
Apr 9, 5:33 PM CDT	Special Weather Statement	EWX	Frio	57 min
Apr 9, 5:46 PM CDT	Severe Thunderstorm Warning	EWX	Frio	44 min
Apr 9, 6:00 PM CDT	Severe Thunderstorm Warning	EWX	Frio, Medina	30 min
Apr 9, 6:24 PM CDT	Special Weather Statement	EWX	Medina	66 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.